JDK-6840293 : environment variables '_java_options' and 'java_tool_options' are disregarded on Windows Vista
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Users on the java.sun.com forums have indicated that the fix for 6770420 is incomplete. Some code specific to the Windows Vista port of the new Java Plug-In was not adjusted to support these environment variables.
On windows Vista, the client vm is being launched through a custom launcher (jp2launcher). To ensure that the '_java_options' and 'java_tool_options' environment variables are preserved, we need to make sure those environment variables are not being erased in the jp2launcher prior to launching of the client vm.